Plants vs Zombies is a tower defense game developed by PopCap Games and released in 2009, where players use different plants to stop waves of zombies reaching their house. Its humorous art style, memorable music and expressive zombie sounds helped it become a lasting pop culture favourite across PC, mobile and consoles. Clips from the game later spread widely in meme edits, streams and short videos, where this zombie themed audio is used as shorthand for a silly invasion, a creeping threat or a garden battle about to begin.